Exhibit 24POWER OF ATTORNEY          KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature appears below constitutesand appoints MICHAEL I. ROTH, FRANK MERGENTHALER, CHRISTOPHER F. CARROLL and NICHOLAS J. CAMERA,and each of them, as true and lawful attorneys-in-fact and agents with full power of substitutionand resubstitution, for him or her, and in his or her name, place and stead, in any and allcapacities, to sign the Report on Form 10-K for the year ended December 31, 2007, for TheInterpublic Group of Companies, Inc., S.E.C. File No. 1-6686, and any and all amendments andsupplements thereto and all other instruments necessary or desirable in connection therewith, andto file the same, with all exhibits thereto, and all documents in connection therewith, with theSecurities and Exchange Commission and the New York Stock Exchange, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each andevery act and thing requested and necessary to be done in and about the premises as fully to allintents and purposes as he or she might do or could do in person, hereby ratifying and confirmingall that said attorney-in-fact and agents or any of them or their or his or her substitute orsubstitutes, may lawfully do or cause to be done by virtue hereof.Dated: February 29, 2008     /s/ Michael I. Roth     Michael I. Roth /s/ Frank J. Borelli     Frank J. Borelli       /s/ Reginald K. Brack /s/ Jocelyn Carter-Miller           Reginald K. Brack     Jocelyn Carter-Miller       /s/ Jill M. Considine /s/ Richard A. Goldstein           Jill M. Considine     Richard A. Goldstein       /s/ H. John Greeniaus /s/ Mary J. Steele Guilfoile           H. John Greeniaus     Mary J. Steele Guilfoile       /s/ William T. Kerr /s/ J. Phillip Samper           William T. Kerr     J. Philip Samper       /s/ David M. Thomas /s/ Frank Mergenthaler         David M. Thomas     Frank Mergenthaler       /s/ Christopher F. Carroll             Christopher F. Carroll    
 

 
THE INTERPUBLIC GROUP OF COMPANIES, INC.Certified Resolutions          I, Nicholas J. Camera, Secretary of The Interpublic Group of Companies, Inc. (the“Corporation”), hereby certify that the resolutions attached hereto were duly adopted on February29, 2008 by the Board of Directors of the Corporation and that such resolutions have not beenamended or revoked.          WITNESS my hand and the seal of the Corporation this 29th day of February, 2008.                 /s/ Nicholas J. Camera   Nicholas J. Camera     
 

 
     THE INTERPUBLIC GROUP OF COMPANIES, INC.MEETING OF THE BOARD OF DIRECTORSResolutions re Form 10-K          RESOLVED, that the Chairman of the Board and the Executive Vice President and Chief FinancialOfficer of the Corporation be, and each of them hereby is, authorized to execute and deliver onbehalf of the Corporation an annual report on Form 10-K for the year ended December 31, 2007, inthe form presented to this meeting with such changes therein as either of them with the advice ofthe General Counsel shall approve; and further          RESOLVED, that the Chairman of the Board in his capacity as Chief Executive Officer, theExecutive Vice President and Chief Financial Officer in his capacity as Chief Financial Officer,and the Senior Vice President, Controller and Chief Accounting Officer in his capacity as ChiefAccounting Officer of the Corporation be, and each of them hereby is, authorized to execute suchannual report on Form 10-K; and further          RESOLVED, that the officers of the Corporation be and each of them hereby is, authorized anddirected to file such annual report on Form 10-K, with all the exhibits thereto and any otherdocuments that may be necessary or desirable in connection therewith, after its execution by theforegoing officers and by a majority of this Board of Directors, with the Securities and ExchangeCommission and the New York Stock Exchange; and further          RESOLVED, that the officers and directors of the Corporation who may be required to executesuch annual report on Form 10-K be, and each of them hereby is, authorized to execute a power ofattorney in the form submitted to this meeting appointing Michael I. Roth, Frank Mergenthaler,Christopher F. Carroll and Nicholas J. Camera, and each of them, severally, his or her true andlawful attorneys and agents to act in his or her name, place and stead, to execute said annualreport on Form 10-K and any and all amendments and supplements thereto and all other instrumentsnecessary or desirable in connection therewith; and further          RESOLVED, that the signature of any officer of the Corporation required by law to affix hissignature to such annual report on Form 10-K or to any amendment or supplement thereto and suchadditional documents as they may deem necessary or advisable in connection therewith, may beaffixed by said officer personally or by any attorney-in-fact duly constituted in writing by saidofficer to sign his name thereto; and further          RESOLVED, that the officers of the Corporation be, and each of them hereby is, authorized toexecute such amendments or supplements to such annual report on Form 10-K and such additionaldocuments as they may deem
 

 
necessary or advisable in connection with any such amendment or supplement and to file theforegoing with the Securities and Exchange Commission and the New York Stock Exchange; and further          RESOLVED, that the officers of the Corporation be, and each of them hereby is, authorized totake such actions and to execute such other documents, agreements or instruments as may benecessary or desirable in connection with the foregoing.